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Tip revision: 136057256686de39cc3a07c2e39ef6bc43003ff6 authored by Linus Torvalds on 21 November 2021, 21:47:39 UTC
Linux 5.16-rc2
Linux 5.16-rc2
Tip revision: 1360572
stacktrace.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Stack trace management functions
*
* Copyright (C) 2009-2021 Helge Deller <deller@gmx.de>
* based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
* and parisc unwind functions by Randolph Chung <tausq@debian.org>
*
* TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
*/
#include <linux/kernel.h>
#include <linux/stacktrace.h>
#include <asm/unwind.h>
static void notrace walk_stackframe(struct task_struct *task,
struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *cookie)
{
struct unwind_frame_info info;
unwind_frame_init_task(&info, task, NULL);
while (1) {
if (unwind_once(&info) < 0 || info.ip == 0)
break;
if (__kernel_text_address(info.ip))
if (!fn(cookie, info.ip))
break;
}
}
void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
struct task_struct *task, struct pt_regs *regs)
{
walk_stackframe(task, regs, consume_entry, cookie);
}
int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
struct task_struct *task)
{
walk_stackframe(task, NULL, consume_entry, cookie);
return 1;
}